The rollout of the Polkadot protocol has been ongoing since August, when the project launched its Rococo testnet.
Source: https://cointelegraph.com/news/polkadot-announces-kusama-is-finally-ready-to-host-parachains
Polkadot announces Kusama is ‘finally ready to host parachains’
May 18, 2021
CoinTelegraph